Geometrical block



(ModeL) 3Sheets-Sheet 2.

H. KENNEDY.

GEOMETRIGAL BLOCK.

No.'2'70,225. Patented Jan. 9,1883.

6 Mew.-

(ModeL) V 3 Sheets-Sheet 3. A. H. KENNEDY.

GEOMBTRIGAL BLOCK.

No.270,z25. v Patented JaI'1.9,1B83.

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UNITED. STATES PATENT Orrrcn.

I ALBERT H. KENNEDY, OF ROCKPORT, INDIANA.

GEOMETRICAL BLOCK.

SPECIFICATION forming part of Letters Patent No. 270,225, dated January 9, 1853.

Application filed June 22, 1881. (Model.)

metrical Blocks, of which the following is a.

specification.

My invention relates to improvements in geometrical blocks in which the several round surfaces and solids are dissected, so that their parts may be separated and show the elements of which they are composed and be rearranged into simpler forms, and thus illustrate the rules of mensuration.

The objects of my invention are to provide cheapanddurablehingesfortheseieralfbrmssuch as can be fitted to the elementary parts by machinery-to so fit these hinges that they may keep the parts to which they are fastened in perfect line, and afford an easy and a rapid manipulation. I attain these objects by the mechanisms illustratedin the accompanying drawings, in which- Figure 1 illustrates the circle and its elementary'structure. A cylinder of sufficient length is divided into an even number of sec tors, a b c, &c. A strap is embedded into its circumference and secured to the several sectors by screws, as shown at m n 0, 8m. Fig. 2 shows one edge or convex side of this cylinder, the embedded-strap, and the screws.

Fig. 3 illustrates the use of the apparatus.

I One half of the sectors shown in Fig. 1, a b c,

8tc., are interposed into the other half, 9 h '5, 8tc.,making a parallelogram whose dimensions are the circles semi-circumference and semidiameter.

Figs. 4, 5, and 6 illustrate the cylinder. Fig. tis a cross-section at right angles to the axis through the embedded strap and the screws that fasten it to the several parts, cob c, 860, Fig. 5 shows the convex surface of the cylinder, the two embedded straps and the screws that fasten them to the several cylindrical wedges. Fig. 6 illustrates the use of the apparatus-viz one half of the cylindrical wedges, (t b c, 800., of Fig. 4 is interposed in the other half, d of, &c., forming a parallelepiped whosev dimensions are the cylinders length, semi-circumference, and semi'dlameter.

Figs. 7,8, and 9 illustrate the sphere. Fig. 7 represents a spherical wedge, in whieha b c, &c., represent the pyramids of which it is composed. These pyramids are connected together by a strap and screws, g 9.9, 850., embedded in their bases. Fig. 8 shows Fig.7 unfolded. Fig.9showshow theseveralspherical wedges that make up a sphere are united. h h, &c., is a circular piece of leather, fastened byscrews t0 the ends or poles of the sev- 6o eral spherical wedges. g g g, &c., represent the embedded straps. By these means the sphere can be unfolded and its several spherical wedges made to assume the form shown in Fig. 8; or they can be closed up and each made to assume the form shown in Fig.7, making a complete sphere. By means of the pins or staples shownatf, Fig. 7, and an encircling string all the parts may be held in a spherical shape.

Fig 10 illustrates the cone and the frustum of the cone. The method of hinging-the several parts, 0 d e, 820., is the same as described above in Figs. 1 and 2. The apparatus shows that the cones surface is composed of triangles, and that the convex surface of the frustum of a cone cut off at a b is composed'of trapezoids.

The advantages of the methods of hinging the several elements of the forms described above are manifest. as described the several forms maintain their symmetry, are strong and durable, are kept in perfect line, and can be rapidly transformed, so as to show in the most forcible manner their By embedding a strap structure and the fundamental principles upon which their measurement is based.

' I am aware that prior tomy invention dissected geometrical blocks have been made.

The idea that underlies the system is as old as Euclid. He makes the triangle the element of the circle and the cones convex surface, and the pyramid the element of the cones and the spheres volume.

It is manifest therefore that only the methods of hinging the dissected or 5 1. The dissected blocks or segments of a are held together and kept in perfect line, and sphere, substantially as shown and described, the whole made strong and durable, substan 10 having the channeled sections, the straps or tiaily as and for the purpose set forth. hinges connectingthein together, substantially 5 as and for the purpose set forth. KENNEDY V 2. The combination of the grooves and the Witnesses:

embedded strap by which the parts or elements W. O. SHAW, of the several round bodies herein described FRANK A. NIBLACK. 

